Speaking about how multiculturalism could change how people talk in the capital, he added: “Given the status of London as the linguistically most influential city in the English-speaking world, we can expect to see significant changes between now and the middle of the century.

“The major changes in the way we speak over the next 50 years will involve a simplification of the sound structure of words, they’ll become shorter probably

“By looking at how English has changed over the last 50 years we can identify patterns that seem to repeat. British accents seem to be less based on class these days.

“Languages also change when they come into contact with one another. English has borrowed thousands of words from other languages: mainly French, Latin and Greek, but there are ‘loan words’ from dozens of other languages in the mix.”

Watt wrote the report with dialect coach Brendan Gunn, who has coached Robert De Niro, Penelope Cruz, and Brad Pitt.

Gunn has also lectured in linguistics at the University of Ulster.

The Brummie accent spoken by characters in gangster drama Peaky Blinders is also said to be heading for the exit door

The Sounds of 2066 report says age rather than class is driving the change.

Their study claims: "The Queen's English spoken by Prince George as he grows up is not going to be the same as the Queen's English spoken by the Queen."

It adds that the "Queen's English" has largely lost it impact, and states: "Where once it was more or less obligatory to speak these for anyone wishing to enter the professions, the clergy, the upper ranks of the military, acting or broadcasting, these days non-standard accents and dialects are much more widely accepted.

"We've come to realise that speaking in such and such a way isn't necessarily a sure sign of someone's intelligence or competence.

"This improves opportunities for people from a wider variety of social and educational backgrounds."

The Sounds of 2066 report was produced by studying recordings from the last 50 years, and by analysing language used is social media.

It was commissioned by HSBC to coincide with the launch of its new voice ID.

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